package com.zt.utils;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;
import org.springframework.context.annotation.Configuration;

import java.util.Calendar;
import java.util.Map;

@Configuration
public class JwtToken {
    private static String str = "zt666";

    /**
     * 创建jwt
     *
     * @return
     */
    public static String createJetToken(Map<String, Object> claims) {

        String token = JWT.create()
                //添加载荷
                .withClaim("claims", claims)
                //添加过期时间
                .withExpiresAt(getCalendar().getTime())
                //指定算法 配置密码
                .sign(Algorithm.HMAC256(str));
        return token;
    }

    /**
     * 获取过期时间 System.currentTimeMillis(); 可能出现负数
     *
     * @return
     */
    public static Calendar getCalendar() {
        Calendar c = Calendar.getInstance();
        c.set(Calendar.SECOND, 60 * 60 * 24);
        return c;
    }

    public static Map<String, Object> resolveJwt(String headerToken) {
        //require申请一个JWT的验证器 通过build生成一个验证器
        JWTVerifier verifier = JWT.require(Algorithm.HMAC256(str)).build();
        //通过 verifier 去验证token 生成解析后的jwt对象
        DecodedJWT verify = verifier.verify(headerToken);
        Map<String, Object> claims = verify.getClaim("claims").asMap();
        return claims;

    }
}
